Seeing condition influences the spatial resolution in the near-infrared range. The seeing condition at the TAO site was investigated by Motohara et al. 2008. The 10%-ile, 25%-ile, and median values of the measured V-band seeing are 0.38, 0.51, and 0.69 arcsec, respectively. The typical range is expected to be 0.3-1.3 arcsec.